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professional quality open source examples

I am wondering if there are any open source examples of good PHP design? Seems that every man and his dog can code basic PHP, so now there is a lot of open source PHP code which is not very high quality.

I was wondering if anyone knew any examples of particularly good quality coding which I could use to learn good practices?

wordpress would have to be amongst the highest regarded open source php applications, and also the wiki thing (mediawiki?) mentioned above must be pretty good (although I haven't seen the code before).

No doubt there are others - most popular applications are strengthened by their popularity, but i'm sure studying those two will be more than enough to look at.

Worpress is a mess. It's an example of low quality, hacked up together php application. The fact that is popular is irrelevant code wise.

it might be a bit of a mess (although constantly improving), but you can't really compete with the combined brains of well... everyone and anyone (in a controlled environment). The core code is very strong IMO.

There are some very good programmers tools in php: wact, cake, simpletest etc, but most end-user applications are a total nightmare. Ironically, in php world, the more popular an app is, the worse is its quality.

Thanks guys, those frameworks look like they could be quite helpful in creating better code, even their websites have a much more professional feel. I'll have a look too at those apps you guys mentioned.